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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang (from 3.2 to the current trunk) hangs on valid code at -Os and above on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=18596">18596</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang (from 3.2 to the current trunk) hangs on valid code at -Os and above on x86_64-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following testcase causes the current clang trunk (as well as 3.2 to 3.4)
to hang when compiling at -Os and above in both 32-bit and 64-bit mode on
x86_64-linux-gnu.
This is a regression from clang 3.1.
$ clang-trunk -v
clang version 3.5 (trunk 199196)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
$
$ clang-trunk -O1 small.c; a.out
$ clang-3.1 -Os small.c; a.out
$
$ timeout -s 9 30 clang-trunk -Os small.c
Killed
$ timeout -s 9 30 clang-3.4 -Os small.c
Killed
$ timeout -s 9 30 clang-3.3 -Os small.c
Killed
$ timeout -s 9 30 clang-3.2 -Os small.c
Killed
$
$
-----------------------------------------
int a, b, c, e[1], f, g, h, i, k, m, n;
short j;
struct
{
short f1;
} d;
static int
fn1 (int p1)
{
int l = 64696;
for (f = 0; f != 1; f--)
{
if (d.f1 > l)
{
h = p1;
if (!h)
l = 0;
}
else
return b;
for (; a; a++)
if (e[a])
break;
}
for (; p1; p1++)
{
if (h)
continue;
if (l)
i = j = k = g && d.f1 != p1;
for (; h != 1; h++)
;
}
return 0;
}
int
main ()
{
m = c = 1;
n = fn1 (c);
return 0;
}</pre>
</div>
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